【摘要】 通过合理的组织、成分设计,在实验室试制成功X100管线钢。利用光学显微镜、透射电镜与背散射电子衍射技术(EBSD),研究了X100钢不同组织构成对力学性能的影响规律及其合理的控冷制度,并通过Gleeble-1500热模拟机获得了试验钢的CCT曲线。结果表明,少量AF(Acicular Ferrite)、GB(Granular Bainite)组织的出现,可使原奥氏体晶粒得到分割,抑制板条束的过分长大,使板条贝氏体束的有效晶粒尺寸得到显著细化,钢板具有最优的细化组织,塑韧性得到明显改善;冷却速度为20~25℃/s,终冷温度为380℃时,钢板可获得最佳的组织构成与最优的综合力学性能,屈服强度为775 MPa,抗拉强度为855 MPa,伸长率为16.6%,冲击功(-20℃)为218 J。更多还原

【Abstract】 By proper composition and microstructure designing, the test X100 pipeline steels were prepared successfully in lab.The effect of microstructure on mechanical properties was studied with OM,TEM,EBSD analysis,and continuous cooling transformation curves were obtained with Gleeble-1500 thermomechanical simulator.The result indicates,the specimen rolled with final cooling temperature of about 380 ℃ and cooling speed of 20-25 ℃/s consists of lath like bainite,granular bainite and acicular ferrite,and has optimum microstructure and excellent integra-ted mechanical properties:ReL=775 MPa,Rm=845 MPa,A=16.6%,AKV(-20 ℃)=218 J.更多还原